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before birth, the fetus is attached to the placenta (which feeds it) by the umbilical cord. when the baby is born, the doctor cuts the umbilical cord. a few days later, the piece of the umbilical cord that was still attached to the baby falls off the belly, leaving a small rise in the belly: the belly button. of the next decade and a half or so, the rise in the belly sinks in and becomes a small cave.
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